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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.3K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
41.3K

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Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway
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在基于石墨的阳极材料中发现早期间歇机制.

Jafar Azizi1, Axel Groß1, Holger Euchner2

  • 1Institute of Theoretical Chemistry, Ulm University, Ulm D-89081, Germany.

ACS applied materials & interfaces
|May 28, 2025
PubMed
概括

在低度下,石墨中的间是能量不利的,与不同. 早期间歇的这种差异解释了离子电池的性能问题,并建议以 heteroatom doping 为解决方案.

科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 计算化学计算化学

背景情况:

  • 石墨是离子电池的标准阳极材料,也是离子电池的候选材料.
  • 在石墨中干的初始阶段与干的显著不同.
  • 对这些早期过程的更深入的理解对于开发先进的电池技术至关重要.

研究的目的:

  • 用计算方法阐明石墨材料中 (K) 的早期间隙.
  • 为了比较K与 (Li) 和 (Na) 在石墨系统中的介质行为.
  • 确定控制初始K间隔的因素及其对电池性能的影响.

主要方法:

  • 密度函数理论 (DFT) 的计算被用来建模合过程.
  • 该研究的重点是范德瓦尔斯相互作用和金属-碳键形成之间的竞争.
  • 在石墨材料中对K,Li和Na的间歇性行为进行了比较.

主要成果:

  • 层间范德瓦尔斯力和金属-碳结合之间的竞争对于大型金属原子至关重要.
  • 在低度的石墨材料中,间变得在能量方面不利,与不同.
  • 这些发现解释了观察到的Li和K间隔行为差异以及潜在的电池性能问题.
关键词:
在 DFT 方面,它是最重要的.性金属是一种性金属.阳极材料是一种阳极材料.石墨烯酸石墨是一种石墨.干扰机制的干扰机制.

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结论:

  • 确定K间隔的初始阶段是导致性能损失和电池故障的关键因素.
  • 在石墨中早期的K介质的能量不利性对离子电池的开发构成了挑战.
  • 异原子兴奋剂被提出作为一种潜在的策略,以克服这些局限性并提高电池性能.